RALBP1 Antibody – Mouse Monoclonal

RALBP1 plays a role in receptor-mediated endocytosis and is a downstream effector of the small GTP-binding protein RAL (see RALA; MIM 179550). Small G proteins, such as RAL, have GDP-bound inactive and GTP-bound active forms, which shift from the inactive to the active state through the action of RALGDS (MIM 601619), which in turn is activated by RAS (see HRAS; MIM 190020) (summary by Feig, 2003 [PubMed 12888294]).[supplied by OMIM, Nov 2010]

RALBP1: Can activate specifically hydrolysis of GTP bound to RAC1 and CDC42, but not RALA. Mediates ATP-dependent transport of S-(2,4-dinitrophenyl)-glutathione (DNP-SG) and doxorubicin (DOX) and is the major ATP-dependent transporter of glutathione conjugates of electrophiles (GS-E) and DOX in erythrocytes. Can catalyze transport of glutathione conjugates and xenobiotics, and may contribute to the multidrug resistance phenomenon. Serves as a scaffold protein that brings together proteins forming an endocytotic complex during interphase and also with CDK1 to switch off endocytosis, One of its substrates would be EPN1/Epsin. Interacts with the GTP-bound form of RALA, RALB, CDC42 and RAC1. Interacts with REPS1 and REPS2 and this does not affect the Ral-binding activity. Interacts with DAB2IP. Interacts with catalytically active CCNB1 and CDK1 during mitosis. Interacts with EPN1, NUMB and TFAP2A during interphase and mitosis. Expressed ubiquitously but at low levels. Shows a strong expression in the erythrocytes.

Protein type: GAPs, Rac/Rho; GAPs

Chromosomal Location of Human Ortholog: 18p11.3

Cellular Component: membrane; cytosol

Molecular Function: protein binding; ATPase activity, coupled to movement of substances; ATPase activity; Rac GTPase binding; Ral GTPase binding; GTPase activator activity

Biological Process: regulation of GTPase activity; regulation of small GTPase mediated signal transduction; transport; metabolic process; small GTPase mediated signal transduction; chemotaxis; signal transduction